The castle was abundantly provided with men, arms, provisions, and a spring of water; its situation rendered it impossible to make use of mounds and turrets, and the machinery usually employed in a siege; the path to it was very narrow, with a precipice on each side. The moving galleries were pushed forward with infinite hazard, and to no purpose; for, when they advanced toward the garrison, they were either destroyed by fire or crushed by prodigious stones. The soldiers could neither maintain their footing nor make use of their batteries without exposing themselves to continual danger. The most adventurous were either slain or wounded, and the rest were greatly discouraged. Marius, having thus spent many toilsome days, now hesitated whether he should abandon his enterprise, which had proved unsuccessful, or wait the interposition of fortune, which had so frequently befriended him. While these reflections day and night occupied his mind, a Ligurian, a common soldier of the auxiliary cohorts, who had gone out of the camp in search of water, happened to observe, not far from the opposite side of the castle, some periwinkles creeping among the rocks; gathering one, then another, and still climbing to procure more, he was led insensibly almost to the top of the mountain, where, perceiving all was quiet in that quarter, the natural desire of viewing unknown objects prompted him to proceed. It chanced that an oak-tree, of considerable magnitude, here grew out of the side of the rock, and, bending its trunk downward near the root, then taking a turn, mounted upward, as is natural to trees in such situations. By the help of this, the Ligurian, laying hold of the branches of the tree or of the prominences of the rock, was at length enabled to survey the whole plan of the castle, without being disturbed by the Numidians, who were all engaged on that side on which the attack had been made. Having carefully examined whatever he thought would be useful to him in the execution of his design, he returned the same way; not hastily, as he went up, but pausing at every step, and observing everything with the utmost care.